I know you mentioned 24x40 and someone mentioned 30x40. Mine is right in between @ 34x34. I have 14' ceilings so no pictures of a vaulted ceiling.
I am in a similar situation whereas I have a two car on the house where my wife and I park our daily drivers, lawn and garden equipment, bicycles and bar-b-que, occassionaly the Harleys. Nothing other than tools, equipment and projects go in the shop.
When I first built my shop back in 1995 it seemed huge but let me tell you if you are addicted to tools like I am and probably most on the forum here, they fill up FAST. I operate a small business out of my home shop and it would be tough to get two full-size vehicles into it. It stated out as a two car plus shop and has reduced in size to a single car/truck, motorcycle and fabrication section shop.
It appears to be tight, which it is but over the past 20 years now I have built and turned out a lot of custom bikes, street rods, musclecars, sandrails, drag quads and snowmobiles out of my little home work shop. You just have to think smart on where you put equipment and really think out the added value of equipment prior to purchase and installation. Meaning if it is something you don't see yourself using much, don't buy it.
Here is a picture of my 1150 square foot shop from the outside. Sorry, not a very good overall pictures.
Here is from the man door looking it towards the welding and machining portion.
Here is from standing just inside the large rollup door looking into the motorcycle, welding and machining section. The bike lift tables generally are spread out more for space to work around. They are crowded together merely to gain some space as I had no bikes in the shop at the time this pictures was taken.
Here is looking from just inside the man door towards the automotive portion where my 10k pound two-post lift is. You can see a full-size truck on the lift fills up the shop fast.
I don't have any motorcycles in the shop in this picture but there is usually at least one bike on a lift, many times two bikes on lifts and one or two bikes sitting on the floor behind them (closer to the door).
Mike.